<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        // concat()

        // 合并数组或元素，返回新的数组，原数组不会改变
        let arr1  = ['张飞', '关羽' , '刘备'];
        let arr2 = ['猴子', '黑鸟'];
        let arr3 = ['剑圣', '娜迦'];

        //  1.参数是一个或多个数组
        // let  result1 = arr1.concat(arr2);
        let result1 = arr1.concat(arr2,arr3);

        // 2.原数组不受影响
    // console.log(arr1,arr2, result1);
    console.log(result1);

    // 3.参数是元素
    let result2 = arr1.concat("吕布");
    console.log(result2);

    let result3 = arr2.concat("大鹏");
    console.log(result3);
    </script>
</body>
</html>